缺少缓存设备的 zpool 导入

Question

打算尝试 SmartOS，部分原因是我对 FreeNAS 的使用不满意。在旧缓存驱动器上为 SmartOS 区域创建了新的 zpool。那只是背景故事。关键是现在无法在 Ubuntu 15.04 上导入旧的 FreeNAS 池。

  pool: pool5                                                            
    id: 14850262647910895720                                              
 state: UNAVAIL                                                           
status: The pool was last accessed by another system.                     
action: The pool cannot be imported due to damaged devices or data.       
  see: http://zfsonlinux.org/msg/ZFS-8000-EY                              
config:                                                                   

    pool5                               UNAVAIL  missing device        
      raidz2-0                          ONLINE                         
        ata-WL3000GSA6472_WOL240282406  ONLINE                         
        ata-WL3000GSA6472_WOL240282471  ONLINE                         
        ata-WL3000GSA6472_WOL240282504  ONLINE                         
        ata-WL3000GSA6472_WOL240282506  ONLINE                         
        ata-WL3000GSA6472_WOL240282472  ONLINE                         
    cache                                                              
      ata-ST31500341AS_6VS073SA                                        

  pool: zones                                                             
    id: 513536768382594111                                                
 state: ONLINE                                                            
status: The pool was last accessed by another system.                     
action: The pool can be imported using its name or numeric identifier and 
       the '-f' flag.                                                     
  see: http://zfsonlinux.org/msg/ZFS-8000-EY                              
config:                                                                   

       zones                        ONLINE                                
         ata-ST31500341AS_6VS073SA  ONLINE                                   

我已经摧毁了区域。

尝试了大部分的力选项和组合，结果相似：

$ sudo zpool import pool5
cannot import 'pool5': pool may be in use from other system, it was last accessed by freenas.local (hostid: 0x8120288a) on Tue Oct 27 16:24:56 2015
$ sudo zpool import -f pool5
cannot import 'pool5': one or more devices is currently unavailable
$ sudo zpool import -Ff pool5
cannot import 'pool5': one or more devices is currently unavailable
$ sudo zpool import -fm pool5
cannot import 'pool5': one or more devices is currently unavailable
$ sudo zpool import -FfmX pool5
cannot import 'pool5': one or more devices is currently unavailable
$ sudo zpool import -fD pool5
cannot import 'pool5': no such pool available
$ sudo zpool import -nF pool5
cannot import 'pool5': pool may be in use from other system, it was last accessed by freenas.local (hostid: 0x8120288a) on Tue Oct 27 16:24:56 2015
use '-f' to import anyway
$ sudo zpool import -m pool5
cannot import 'pool5': pool may be in use from other system, it was last accessed by freenas.local (hostid: 0x8120288a) on Tue Oct 27 16:24:56 2015
use '-f' to import anyway

$ sudo zdb -e pool5 说：

Configuration for import:
        vdev_children: 2
        version: 5000
        pool_guid: 14850262647910895720
        name: 'pool5'
        state: 0
        hostid: 2166368394
        hostname: 'freenas.local'
        vdev_tree:
            type: 'root'
            id: 0
            guid: 14850262647910895720
            children[0]:
                type: 'raidz'
                id: 0
                guid: 142933150631883837
                nparity: 2
                metaslab_array: 33
                metaslab_shift: 37
                ashift: 12
                asize: 15002891714560
                is_log: 0
                create_txg: 4
                children[0]:
                    type: 'disk'
                    id: 0
                    guid: 79266291072794538
                    whole_disk: 1
                    DTL: 356
                    create_txg: 4
                    path: '/dev/disk/by-id/ata-WL3000GSA6472_WOL240282406-part1'
                children[1]:
                    type: 'disk'
                    id: 1
                    guid: 1087294782673888508
                    whole_disk: 1
                    DTL: 258
                    create_txg: 4
                    path: '/dev/disk/by-id/ata-WL3000GSA6472_WOL240282471-part1'
                children[2]:
                    type: 'disk'
                    id: 2
                    guid: 2219503574895013140
                    whole_disk: 1
                    DTL: 257
                    create_txg: 4
                    path: '/dev/disk/by-id/ata-WL3000GSA6472_WOL240282504-part1'
                children[3]:
                    type: 'disk'
                    id: 3
                    guid: 6460403329296563235
                    whole_disk: 1
                    DTL: 202
                    create_txg: 4
                    path: '/dev/disk/by-id/ata-WL3000GSA6472_WOL240282506-part1'
                children[4]:
                    type: 'disk'
                    id: 4
                    guid: 9844978706073275260
                    whole_disk: 1
                    DTL: 167
                    create_txg: 4
                    path: '/dev/disk/by-id/ata-WL3000GSA6472_WOL240282472-part1'
            children[1]:
                type: 'missing'
                id: 1
                guid: 0
zdb: can't open 'pool5': No such device or address

版本：

libzfs2    0.6.5.3-1~vivid amd64 Native OpenZFS filesystem library for Linux
ubuntu-zfs 9~vivid         amd64 Native ZFS filesystem metapackage for Ubuntu.
zfs-dkms   0.6.5.3-1~vivid amd64 Native OpenZFS filesystem kernel modules for Linux
zfsutils   0.6.5.3-1~vivid amd64 Native OpenZFS management utilities for Linux

尝试从 devnodes 导入：

~/tmp$ ln -s $(for link in /dev/disk/by-id/ata-WL3000GSA6472_WOL240282406* /dev/disk/by-id/ata-WL3000GSA6472_WOL240282471* /dev/disk/by-id/ata-WL3000GSA6472_WOL240282504* /dev/disk/by-id/ata-WL3000GSA6472_WOL240282506* /dev/disk/by-id/ata-WL3000GSA6472_WOL240282472* ; do readlink -f "${link}" ; done) ./
~/tmp$ ls
sdb  sdb1  sdb9  sdc  sdc1  sdc9  sdd  sdd1  sdd9  sde  sde1  sde9  sdf  sdf1  sdf9
~/tmp$ sudo zpool import -d ./ pool5
cannot import 'pool5': pool may be in use from other system, it was last accessed by freenas.local (hostid: 0x8120288a) on Tue Oct 27 16:24:56 2015
use '-f' to import anyway
~/tmp$ sudo zpool import -fd ./ pool5
cannot import 'pool5': one or more devices is currently unavailable

以及奇怪的部分（ada1 是什么？哦。可能是一个 freebsd devnode）：

$ sudo zpool import -d tmp
   pool: pool5
     id: 14850262647910895720
  state: UNAVAIL
 status: The pool was last accessed by another system.
 action: The pool cannot be imported due to damaged devices or data.
   see: http://zfsonlinux.org/msg/ZFS-8000-EY
 config:

        pool5        UNAVAIL  missing device
          raidz2-0   ONLINE
            sde      ONLINE
            sdc      ONLINE
            sdd      ONLINE
            sdb      ONLINE
            sdf      ONLINE
        cache
          ada1

我可以重新初始化缓存设备以便它可以再次找到它吗？缓存设备存储了多少有关其池的信息？仅创建另一个 zpool 并将其作为缓存添加到其中是否可行？zdb 似乎没有为它列出一个 guid - 它只需要一个免费的缓存驱动器吗？我可以制作一个缓存驱动器并将其符号链接到 ada1 并让它拾取吗？

Answer 1

Linux 上的 ZFS 是什么版本？导入缺少缓存设备是一个“较新”的功能（不再那么新了，但 ZoL 在过去落后了很多）

另外，如果您不需要它，请尝试销毁“zones”池，以便“pool5”中的缓存设备不会被锁定。您可能会遇到奇怪的情况，因为设备实际上并没有丢失，它只是因为被另一个池锁定而无法使用。

其他要尝试的事情： zpool import -m pool5 （仅对于丢失的日志设备才需要，而不是丢失的缓存设备）

zpool 导入 -nF pool5